Most popular detailed ESP electronic stability sys

2022-08-16
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ESP Electronic Stability Program (ESP) is actually a group of comprehensive strategies for body stability control, including anti lock braking system (ABS) and drive wheel anti slip system (ASR). It can be said that it is a functional extension on the basis of other active and passive safety systems, rather than an independent configuration. So, what is the mystery between the ESP system now equipped on many models? Next, we will analyze it in detail for you

in order to visually and concretely explain the secrets hidden in the ESP system, we will take the ESP system on Sagitar and maiteng as an example. The ESP system matched on these two models includes nine detailed functions, which are: ABS (anti deadlock braking system), EBD (electronic braking force distribution system), ESBs (extended electronic stability braking system), HVV (full deceleration of rear axle), ASR (traction control system), EDL (Miao Wei, Minister of electronic industry and information technology, Xiao Yaqing, director of SASAC, and other five people as deputy team leader differential lock), Masr (engine resistance torque control) HbA (hydraulic assisted braking) and LDE (low power ESP). Next, let's take a look at the functions above and what they will do in daily driving. (Note: the ESP 588.4 series on these two models is not provided by bosh, maiteng is provided by TRW, and Sagitar is provided by continental Teves in Germany.)

abs (anti deadlock braking system)

ABS, which is often mentioned, is called "anti lockbreaksystem" in English and "anti deadlock braking system" in Chinese. The system can brake 60 to 120 times continuously in a second when the wheels are about to lock when the vehicle is braked, which is somewhat similar to the mechanical "spot brake". In this way, it can effectively avoid losing control of direction or wheel sideslip during emergency braking. At the same time, because the wheel will not be locked when braking, and the tire does not rub against the ground at one point, the friction is increased. However, China is basically in the initial stage, making the braking efficiency reach more than 90%

abs anti lock braking system is divided into two types: mechanical and electronic. Mechanical ABS has a simple structure. It mainly uses its own internal structure to achieve the effect of simply adjusting the braking force. There is no sensor to feed back signals such as road friction and wheel speed, and it completely depends on the preset data to work. Therefore, its working mode is the same under any road condition, At present, only some low-end pickup trucks and other models in China still use mechanical ABS. Electronic ABS is composed of hydraulic braking system, wheel speed sensor, electronic controller and electromagnetic regulator. Its working principle is that the wheel speed sensor monitors the wheel speed, and the monitoring signals are collected into the electronic controller for analysis. Once it is detected that the wheels are about to lock up, the electronic controller will send a command to the electromagnetic regulator, which controls the oil pressure distribution valve to adjust the brake wheel cylinder of each wheel, and controls the brake friction pads in the form of "one release and one retraction" to release the locking phenomenon of the wheels

ebd (electronic brake force distribution system)

ebd is also known as ebfd. Its full name is "electronic brake force distribution", which is translated into Chinese as "electronic brake force distribution system". This system can dynamically distribute braking force to four wheels according to vehicle conditions, road conditions and braking status. This system is actually an auxiliary function of ABS

The working principle of the EBD system is as follows:

1. When the driver presses the brake pedal, the EBD starts to work

2. The vehicle mass sensor calculates the vehicle mass and submits it to ECU

3. The wheel sensor collects the current four-wheel speed, friction and other information and transmits it to ECU

4. After receiving the data, ECU calculates how much braking pressure should be allocated to each wheel through the calculation module

5. Start the brake force distributor and inform ABS to stand by

6. Start the ABS system when necessary

7. Braking starts

to put it simply, when the car is braking, if the conditions of four tires attaching to the ground are different, for example, the left wheel is attached to the wet road surface, and the right wheel is attached to the dry road surface, the friction between the four wheels and the ground is different. When braking (the braking force of the four wheels is the same), it is easy to slip, tilt and roll over, and the EBD system will timely adjust the braking pressure of each tire at this time, So as to ensure that the vehicle can decelerate effectively and smoothly

esbs (extended electronic stability braking system)

the English full name of ESBs is "erweitertes stabilities BREMS system", that is, "extended electronic stability braking system". This system is also another auxiliary function of ABS. It can increase the stability of the vehicle registered with Alcoa in 1969 and reduce the risk of skidding. It can effectively avoid serious accidents by stabilizing the vehicle in an emergency and preventing skidding

hvv (full deceleration of rear axle)

the full name of HVV is "hinterachs Vol verzgerung" -- full deceleration of rear axle. The system will increase the brake oil pressure of the rear wheels when the front wheels of the vehicle enter the ABS state, but the rear wheels do not start to act, so that the rear wheels also enter the ABS state, so as to provide rapid braking efficiency and effectively shorten the braking distance

asr (drive anti-skid system)

I believe some friends who are usually interested in vehicles will not be unfamiliar when they see ASR. It is "antriebs schlupf regelung" -- Chinese name is drive anti-skid system, which belongs to active safety device, also known as traction control system. It can effectively prevent the car driving wheel from skidding when accelerating, especially on special roads with low friction such as rain, snow, hail, road freezing, etc

asr system is actually an upgraded version of ABS. It is equipped with expandable hydraulic device, booster pump, hydraulic pressure cylinder, the fourth wheel speed sensor, a complex electronic system and an electronic acceleration system with its own controller. When the driving wheel slips, ASR compares the speed of the wheels, and the electronic system judges whether the driving wheel slips. It immediately automatically reduces the intake of the throttle valve, reduces the engine speed, thereby reducing the power output, and brakes the slipping driving wheel. In this way, the slip can be reduced and the most appropriate power output between the tire and the ground grip can be maintained. At this time, no matter how the oil is supplied, the driving wheel will not slip with the intervention of ASR

edl (electronic differential lock)

the English full spelling of EDL is "Elektronische differential sperre", that is, electronic differential lock. It is also an extended function of ABS, which is used to identify whether the wheel loses friction with the ground, so as to control the acceleration and skid of the car. When the electronic control unit judges that the driving wheel on one side is slipping, the system uses the hydraulic control unit to brake the wheel with appropriate strength, so as to improve the adhesion utilization rate of the driving wheel on the other side and improve the passing capacity of the vehicle

masr (engine resistance torque control)

masr is the driving anti-skid system. The function of this electronic safety system is very similar to that of TCS (traction control system). At present, it is mainly used in Volkswagen's models, which is also the function expansion of ABS. Its function is to identify the slip rate with the help of ABS sensor, and automatically reduce the engine resistance torque with the help of vehicle data bus, so as to reduce the slip rate and ensure the driving stability of the vehicle. In addition, when the vehicle starts or accelerates on the road with poor adhesion conditions, the Masr system can automatically reduce the engine torque, prevent the driving wheel from slipping, and make the vehicle start smoothly

hba (hydraulic assisted braking)

"hydraulic BREMS assistant" -hba, that is, hydraulic assisted braking. This system can increase the brake pressure during emergency stop and provide pressure supplement when the driver presses the brake pedal. That is to say, when the driver quickly presses the brake pedal, the system will immediately increase the braking force to the highest level until the ABS system intervenes to prevent the wheel from locking. When the brake pedal is released, the hydraulic brake assist system will be turned off, and if the anti lock system fails, the system will lose its function and no longer work

summary: in terms of efficacy, these nine functions can be divided into three categories: ABS, EBV and ESBs, which mainly play the role of preventing wheel locking; The main function of Masr, EDL and ASR is to drive anti-skid; In a sense, HVV, EDL and LDE are called "luxury configurations" of ESP, because the existence of these three functions is still rare in the electronic stability system of most models at present. Compared with all the models sold in the domestic market at present, not all of them are equipped with the latest version of ESP system. Therefore, when purchasing vehicles at ordinary times, we should not only pay attention to whether the vehicle is equipped with ESP system, but also further understand whether the matched ESP system is powerful enough

in addition to the functional differences, different versions of ESP systems also have several differences in other aspects. For example, Bosch 8.0 and 8.1 ESP systems, and the ABS and EBD of the 8.1 ESP system are relatively faster than those of the lower versions, and the braking distance is shorter, which can more effectively ensure the braking safety of the vehicle during high-speed driving. In addition, version 8.1 ABS not only reduces the size by 30% on the basis of version 8.0, but also reduces the weight by 25%, and further optimizes the layout and performance of the whole vehicle. At the same time, all electronic harnesses of version 8.1 ABS are hidden in the aluminum shell, which makes its performance more stable and its service life longer. In addition, the operation speed of the higher version of ESP system is also faster (CPU from 8k-16k-48k or even higher 128K), and the braking frequency has also changed from automatic braking several times per second, more than a dozen times, more than 20 times per second, and now up to 150 times per second. Therefore, the main differences between different versions of ESP system are that the efficiency is more optimized (perfect), the stability is stronger, and the safety guarantee of the vehicle is more comprehensive. However, due to cost constraints, its price is also relatively higher. (end)

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